From 6fd435485f270a8c76e47bf7377c1b872885e683 Mon Sep 17 00:00:00 2001 From: Noah Goldstein Date: Thu, 19 May 2022 17:17:59 -0500 Subject: elf: Add tests for the dl hash funcs (_dl_new_hash and _dl_elf_hash) If we want to further optimize the functions tests are needed. Reviewed-by: Siddhesh Poyarekar --- elf/simple-dl-hash.h | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 elf/simple-dl-hash.h (limited to 'elf/simple-dl-hash.h') diff --git a/elf/simple-dl-hash.h b/elf/simple-dl-hash.h new file mode 100644 index 0000000..53702b3 --- /dev/null +++ b/elf/simple-dl-hash.h @@ -0,0 +1,42 @@ +/* __simple_dl_elf_hash for testing true elf symbol lookup. + Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#ifndef _SIMPLE_DL_ELF_HASH_H +#define _SIMPLE_DL_ELF_HASH_H 1 + +#include + +/* For testing/benchmarking purposes. Real implementation in + sysdeps/generic/dl-hash.h. */ +static uint32_t +__attribute__ ((unused)) +__simple_dl_elf_hash (const char *name_arg) +{ + unsigned long int hash = 0; + for (unsigned char c = *name_arg; c != '\0'; c = *(++name_arg)) + { + unsigned long int hi; + hash = (hash << 4) + c; + hi = hash & 0xf0000000; + hash ^= hi >> 24; + hash &= 0x0fffffff; + } + return hash; +} + +#endif /* simple-dl-hash.h */ -- cgit v1.1